Everywhere: Fix badly-formatted includes

In 7c5e30daaa, the focus was "only" on
Userland/Libraries/, whereas this commit cleans up the remaining
headers in the repo, and any new badly-formatted include.

Userland/Applications/PDFViewer/NumericInput.cpp

@@ -5,7 +5,7 @@
  */
 
 #include "NumericInput.h"
-#include "ctype.h"
+#include <ctype.h>
 
 NumericInput::NumericInput()
 {

Userland/Applications/PDFViewer/PDFViewerWidget.cpp

@@ -6,11 +6,9 @@
  */
 
 #include "PDFViewerWidget.h"
-#include "AK/Assertions.h"
-#include "AK/DeprecatedString.h"
-#include "AK/Format.h"
-#include "LibGUI/Forward.h"
-#include "LibPDF/Document.h"
+#include <AK/Assertions.h>
+#include <AK/DeprecatedString.h>
+#include <AK/Format.h>
 #include <AK/HashMap.h>
 #include <AK/HashTable.h>
 #include <AK/Variant.h>
@@ -19,6 +17,7 @@
 #include <LibGUI/Application.h>
 #include <LibGUI/BoxLayout.h>
 #include <LibGUI/FilePicker.h>
+#include <LibGUI/Forward.h>
 #include <LibGUI/InputBox.h>
 #include <LibGUI/Label.h>
 #include <LibGUI/Menu.h>
@@ -30,6 +29,7 @@
 #include <LibGUI/TableView.h>
 #include <LibGUI/Toolbar.h>
 #include <LibGUI/ToolbarContainer.h>
+#include <LibPDF/Document.h>
 
 class PagedErrorsModel : public GUI::Model {
 

Userland/Applications/PDFViewer/PDFViewerWidget.h

@@ -6,11 +6,11 @@
 
 #pragma once
 
-#include "AK/NonnullRefPtr.h"
-#include "AK/RefPtr.h"
 #include "NumericInput.h"
 #include "PDFViewer.h"
 #include "SidebarWidget.h"
+#include <AK/NonnullRefPtr.h>
+#include <AK/RefPtr.h>
 #include <LibGUI/Action.h>
 #include <LibGUI/ActionGroup.h>
 #include <LibGUI/CheckBox.h>

Userland/Applications/PDFViewer/SidebarWidget.h

@@ -6,11 +6,11 @@
 
 #pragma once
 
-#include "LibGUI/ModelIndex.h"
-#include "LibPDF/Document.h"
 #include "OutlineModel.h"
+#include <LibGUI/ModelIndex.h>
 #include <LibGUI/TreeView.h>
 #include <LibGUI/Widget.h>
+#include <LibPDF/Document.h>
 
 class SidebarWidget final : public GUI::Widget {
     C_OBJECT(SidebarWidget)